<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>主页</title>
</head>
<body>
<h1>主页</h1>
<form action="sub" method="post">
    表：
    <select id="sel" name="sel">
        <option>clazz</option>
        <option>student</option>
    </select>
    <input type="submit" value="查询">
</form>
</body>
</html>